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-rw-r--r--app/config/gimpconfig-utils.c223
1 files changed, 223 insertions, 0 deletions
diff --git a/app/config/gimpconfig-utils.c b/app/config/gimpconfig-utils.c
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+++ b/app/config/gimpconfig-utils.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * Utitility functions for GimpConfig.
+ * Copyright (C) 2001-2003 Sven Neumann <sven@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gio/gio.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "config-types.h"
+
+#include "gimpconfig-utils.h"
+
+
+static void
+gimp_config_connect_notify (GObject *src,
+ GParamSpec *param_spec,
+ GObject *dest)
+{
+ if (param_spec->flags & G_PARAM_READABLE)
+ {
+ GParamSpec *dest_spec;
+
+ dest_spec = g_object_class_find_property (G_OBJECT_GET_CLASS (dest),
+ param_spec->name);
+
+ if (dest_spec &&
+ (dest_spec->value_type == param_spec->value_type) &&
+ (dest_spec->flags & G_PARAM_WRITABLE) &&
+ (dest_spec->flags & G_PARAM_CONSTRUCT_ONLY) == 0)
+ {
+ GValue value = G_VALUE_INIT;
+
+ g_value_init (&value, param_spec->value_type);
+
+ g_object_get_property (src, param_spec->name, &value);
+
+ g_signal_handlers_block_by_func (dest,
+ gimp_config_connect_notify, src);
+ g_object_set_property (dest, param_spec->name, &value);
+ g_signal_handlers_unblock_by_func (dest,
+ gimp_config_connect_notify, src);
+
+ g_value_unset (&value);
+ }
+ }
+}
+
+/**
+ * gimp_config_connect:
+ * @a: a #GObject
+ * @b: another #GObject
+ * @property_name: the name of a property to connect or %NULL for all
+ *
+ * Connects the two object @a and @b in a way that property changes of
+ * one are propagated to the other. This is a two-way connection.
+ *
+ * If @property_name is %NULL the connection is setup for all
+ * properties. It is not required that @a and @b are of the same type.
+ * Only changes on properties that exist in both object classes and
+ * are of the same value_type are propagated.
+ **/
+void
+gimp_config_connect (GObject *a,
+ GObject *b,
+ const gchar *property_name)
+{
+ gchar *signal_name;
+
+ g_return_if_fail (a != b);
+ g_return_if_fail (G_IS_OBJECT (a) && G_IS_OBJECT (b));
+
+ if (property_name)
+ signal_name = g_strconcat ("notify::", property_name, NULL);
+ else
+ signal_name = "notify";
+
+ g_signal_connect_object (a, signal_name,
+ G_CALLBACK (gimp_config_connect_notify),
+ b, 0);
+ g_signal_connect_object (b, signal_name,
+ G_CALLBACK (gimp_config_connect_notify),
+ a, 0);
+
+ if (property_name)
+ g_free (signal_name);
+}
+
+static void
+gimp_config_connect_full_notify (GObject *src,
+ GParamSpec *param_spec,
+ GObject *dest)
+{
+ if (param_spec->flags & G_PARAM_READABLE)
+ {
+ gchar *attach_key;
+ gchar *dest_prop_name;
+ GParamSpec *dest_spec = NULL;
+
+ attach_key = g_strdup_printf ("%p-%s", dest, param_spec->name);
+ dest_prop_name = g_object_get_data (src, attach_key);
+ g_free (attach_key);
+
+ if (dest_prop_name)
+ dest_spec = g_object_class_find_property (G_OBJECT_GET_CLASS (dest),
+ dest_prop_name);
+
+ if (dest_spec &&
+ (dest_spec->value_type == param_spec->value_type) &&
+ (dest_spec->flags & G_PARAM_WRITABLE) &&
+ (dest_spec->flags & G_PARAM_CONSTRUCT_ONLY) == 0)
+ {
+ GValue value = G_VALUE_INIT;
+
+ g_value_init (&value, param_spec->value_type);
+
+ g_object_get_property (src, param_spec->name, &value);
+
+ g_signal_handlers_block_by_func (dest,
+ gimp_config_connect_full_notify, src);
+ g_object_set_property (dest, dest_prop_name, &value);
+ g_signal_handlers_unblock_by_func (dest,
+ gimp_config_connect_full_notify, src);
+
+ g_value_unset (&value);
+ }
+ }
+}
+
+/**
+ * gimp_config_connect_full:
+ * @a: a #GObject
+ * @b: another #GObject
+ * @property_name_a: the name of a property of @a to connect
+ * @property_name_b: the name of a property of @b to connect
+ *
+ * Connects the two object @a and @b in a way that property changes of
+ * one are propagated to the other. This is a two-way connection.
+ *
+ * If @property_name is %NULL the connection is setup for all
+ * properties. It is not required that @a and @b are of the same type.
+ * Only changes on properties that exist in both object classes and
+ * are of the same value_type are propagated.
+ **/
+void
+gimp_config_connect_full (GObject *a,
+ GObject *b,
+ const gchar *property_name_a,
+ const gchar *property_name_b)
+{
+ gchar *signal_name;
+ gchar *attach_key;
+
+ g_return_if_fail (a != b);
+ g_return_if_fail (G_IS_OBJECT (a) && G_IS_OBJECT (b));
+ g_return_if_fail (property_name_a != NULL);
+ g_return_if_fail (property_name_b != NULL);
+
+ signal_name = g_strconcat ("notify::", property_name_a, NULL);
+ attach_key = g_strdup_printf ("%p-%s", b, property_name_a);
+
+ g_signal_connect_object (a, signal_name,
+ G_CALLBACK (gimp_config_connect_full_notify),
+ b, 0);
+ g_object_set_data_full (a, attach_key, g_strdup (property_name_b),
+ (GDestroyNotify) g_free);
+
+ g_free (signal_name);
+ g_free (attach_key);
+
+ signal_name = g_strconcat ("notify::", property_name_b, NULL);
+ attach_key = g_strdup_printf ("%p-%s", a, property_name_b);
+
+ g_signal_connect_object (b, signal_name,
+ G_CALLBACK (gimp_config_connect_full_notify),
+ a, 0);
+ g_object_set_data_full (b, attach_key, g_strdup (property_name_a),
+ (GDestroyNotify) g_free);
+
+ g_free (signal_name);
+ g_free (attach_key);
+}
+
+/**
+ * gimp_config_disconnect:
+ * @a: a #GObject
+ * @b: another #GObject
+ *
+ * Removes a connection between @dest and @src that was previously set
+ * up using gimp_config_connect().
+ **/
+void
+gimp_config_disconnect (GObject *a,
+ GObject *b)
+{
+ g_return_if_fail (G_IS_OBJECT (a) && G_IS_OBJECT (b));
+
+ g_signal_handlers_disconnect_by_func (b,
+ G_CALLBACK (gimp_config_connect_notify),
+ a);
+ g_signal_handlers_disconnect_by_func (a,
+ G_CALLBACK (gimp_config_connect_notify),
+ b);
+}
+
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